File Content Extraction 25.1
Filter SDK C Programming Guide

# fpFilter()

Filters text from a document.

## Syntax

    KVErrorCode (pascal* fpFilter)(
        KVDocument pDocument,
        KVFilterOutput* pFilterOutput);

## Arguments

`pDocument` | A `KVDocument` that you created with fpOpenDocumentFromFile() or fpOpenDocumentFromStream().
`pFilterOutput` | A pointer to a KVFilterOutput structure. This structure defines the output buffer.

## Returns

The return value is an error code.

- If the call is successful, the return value is `KVError_Success` and the filtered text is stored in `pFilterOutput`.
- If the call is unsuccessful, the return value is an error code that indicates the problem.

## Discussion

- This function outputs filtered text in chunks. The first call to `fpFilter()` outputs the first chunk of filtered text to `pFilterOutput`. Call `fpFilter()` again to output the next chunk, and repeat this process to obtain all of the filtered text from the document. The final chunk does not contain any text, such that `pFilterOutput->cbText == 0`. Do not call `fpFilter()` again after this.

  IMPORTANT: Do not call any Filter API functions between calls to `fpFilter()`, because doing so might prevent filtering from resuming correctly.

- After each call to `fpFilter`, when you no longer require the data in the `pFilterOutput` structure, call fpFreeFilterOutput to free the memory allocated by this function.

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Version 25.1 | Last updated January 2025

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Product: File Content Extraction 25.1

Topic Title: fpFilter()